Icom IC-7000 VHF/UHF Transceiver "Adjustment Mode"

[[email protected]]

Hi,

I recently bought an Icom IC-7000 transceiver from the estate of a
"silent key". The UHF power output, although the radio is set to
"100 percent power" (all bands), puts out about 50 percent on the
UHF band. UHF watt meter indicates around 18 watts when it
should be 35 watts. Note: Other bands are just fine at 100 percent.

I downloaded the service manual from www.mods.dk and followed
the procedure to enter the "Adjustment" mode. However, I can not
change any settings beyond the "Total Gain (430)! My intention
was to increase the "100 percent" value, which is beyond the "Total Gain"
adjustments, to see if the power goes up. Note: I am using a proper dummy
load.

I couldn't find in the service manual or service manual addendum
any information regarding this issue.

By any chance, did you encounter the same situation?

Thank You in Advance, John N3AOF

PS, Remove "ine" from my email address

 

[Meat Plow]

Do a web search for iCom. They will answer your questions...

I would suspect a problem in the final output, or in the drivers. If you
have the service manual, follow through by verifying the supply voltages
to the final and modulator sections. Also, verify the carrier
amplitude.

I don't know the unit, but also check in the user book to see if there
are any settings for reduced power output.

I am assuming that all the standard procedures of antenna match and etc
has been done...

1. Make sure the SWR on the UHF antenna is 1.5:1 or below. If ok it could
be the hybrid output device. Not knowing the 7000 I would assume that it
would have a separate output device for UHF. However I would verify the
power input to the device and its voltage and AGC circuits before deeming
it bad.

 

[Fred McKenzie]

I downloaded the service manual from www.mods.dk and followed
the procedure to enter the "Adjustment" mode.

John-

If I understand, you are trying to increase power beyond 100%. My
thought is that you are getting all you can with the hardware you have.
The hardware may be defective and the computer can't compensate for that.

My problem is with frequency adjustment. When I enter the Adjustment
mode, I can set the oscillator frequency to exactly what it should be.
However, frequency returns to the previous value when I leave the
Adjustment mode. If I re-enter Adjustment mode, the oscillator
frequency goes back to the correct value, and again reverts when exiting
Adjustment mode.

Do you or anyone else know what I might be doing wrong? Is there a step
I'm missing that makes changes "take"?

Fred
K4DII